A 17-year-old presents with history of progressive exercise intolerance.

Hypertrophic cardiomyopathy (HCM)causesleft ventricular outflow tract obstruction, impairing cardiac output. The low blood pressure, tachycardia, and hypoxemia are classic signs ofventricular dysfunction—specificallydiastolic dysfunctiondue to a thickened, stiff left ventricle.

“HCM may lead to ventricular dysfunction due to impaired relaxation and outflow obstruction, especially during increased demand. Symptoms include hypotension, tachycardia, and hypoxia.”

(Referenced from CCRN Pediatric – Direct Care: Cardiovascular, Cardiomyopathies and Shock States)